Clamping device



Dec. 14, 1954 A. E. ENGELHARDT CLAMPING DEVICE Filed July 14, 1952eflzaraif 6 INVENTOR.

a BY 63 United States CLQSJVIPJNGT DEVICE Engelliardt'," Clii'cagfilll::App'lic'ation July 14, 1952;Serial 1No. 298;807

- z2claims-.- chess-:14

- lhe' presenteinvent-ion relates to clampingtdevices -and has. for itsmain: objectstheprovisionio'f.-a clamping;.:unit for: -simultaneouslytlainping. a ,pair of shaft-s or rods in theirmutually-adjusted:position.

-tAnotherJobject of the ,present invention ais thjesprovision of aclamping d'evice emb'odying :a= pairf-of clamping,

mechanisms,- each capable of: receiving :and :clampingone shaft or rod,each=of whichvmechan-i'sms iswactuat'edto an operatiyejposition; by aseparate knobathe two mechanisms being so interrelated andinterconnected that when one'of said knobs iszoperatedonlybne.shaft orrod is capable: of being -clamped,*lwith :the other shaft or rodnnalfected, and when the other: of said- .knobs is vturned both clampingmeehanisms vbeing eapable:of-simulprovision of a clampingtdevice whichmaytbe capable ot reeeiuingapairofzshafts ofmariousvdiameters.

With the above general objects in view and othersthat will appear as theinvention is: better understood,.fthe

endtof-whichextends heyondii-the adjacent end of sleeve- 13; all as isclearly seenin Fig. 3s Saidcylinder-10tand two cooperating sleeves--1-31 and I 1 5 are provided with diametric "andtregister ing; openingsfor receiving, therewithintshaf tvlfl. Y

Proms-the hereinabove description:itrwill :be quite clearthatwwhenzknobi 112 isturned around boss-L1: and in the directiontoward: the adj'aeentnend of cylinder "10,-; the said cylinder will tendto be driven toward said knob 12,v as is; obvious. I .Since I theadjacent :e'nd ofnsleeve 13- remains in' teonta'ct -=with..-theadjacent-face Oink-nob 12 the shiftingg'ofi-said knobuli towardrcylinderlfl will=necessaril-y tend to urgesaid isl'eeveslsto :shiftto: thedirectionopposite, to -that to which :saidj-"cylinder 210 is urged toshit.

fliherefore-,---due to the, operationiof'-the knob aforfesaid tendenciesto shift; to- 1 then opposite directibn's: are impartedto cylinder F10and sleeve-113.. t Zlhese::sh'iftin'gv tendencies-lo the opposite:idirectionsybyi' thew-two parts will: cause -=the two Qpart's to: pressand: bear: against shaft- 16f-by thC :bodyi-po'rtions. thereof: adjacenttsaid, openings, which-function willscause the clamping. action of;cylinder Lil-and sleeveklii-uponzshaft16,;preventing:the latterfrom-either shifting within -the '-elaimpon from "being entirelywithdrawn i ther e'frorn.

The clampingdevice further. includes eylinder. '17, which is provided atone of its endswithtaconcentric, reduced, l threadedboss 18;, forreceiving; in I a- 1 :threaded engagement 2k-nob 19.wSaid cylinders: isof comparat-ively snialleridimensions than cylinder :10,- and I ofcourse its.diameter.isl -considerablyisrnaller than-tofi cylinder 10.

same? consists in:the novelconstruction,icombinationand arrangement ofparts hereinafter morewfully described, illustrated in theaccompanyingdrawing:andtpointedmut. in-the appended claims. w

' ln the drawing:forn1ing a part of ithis application and in which likedesignating characters refer to corresponding parts.throughout-thezseveral viewsrr t Fig. l show s an: end elevational viewofwthe present device, illustrating i one of thempossible :I-uses:thereof,

namely, when the :same supports- 'a-vdial iindicator for measuring thesurface of a:'cylinder rfashionedvbya lathe or like machine, thew-viewillustratinga stationaryishaft upon which. the clamping e device may: betiadjusted, .and also another shaft which supports the dial indicator;

Fig.2 is aside elevational view of :the present clamping device, theview havingabeen taken. along: the plane indicated; by lines 4 2-2dfcEign 1-;

- Pig. 3 is :a longitudinahcross sectional viewrthroughthe' clampingdevice of a -1-1; refer-rec1 tfor-n'n.

, Fig. '4 is a-transverse cross sectional view-onlline 4'-4- ofFig 3;

HFig. 5 is a =cross-sectional view taken:-onz line5+-5sof Fig. '3;

Fig; 6 is a side elevational viewl of thezpresentdeuice' of a: modifiedform; and Pig. 7- is a :longitudinall cross sectional view through thedevice of amo'dified :form,.-shown in' Fig; =6.

-Referring to the present drawing, andy-particularly to the preferredform of the present device, illustratedain Eigs.--2 to. 5,.- inclusive,theasame includesyoylinder 10, which is provided atoneof its-endswitha-reduced, concentric and threaded boss l'l r Said boss-ll receives-in athreaded-engagement.knob :12. -Set upon-said cylinder.

10 in an encompassing relation is sleeve 13, one,-z outer end of which.is adaprtedu to contact with tires-adjacent end of. knob 12. I"Themppositeiend of said:sleeve' '13 is provided with an: inwardlyextendingbevelled fiange 14, tenure purposeslater"described.

"Set upon said sleeve 13, in an encompassingy rel-atiofntherewith,isouter sleeve -15, the-adjacent fllld-fOfwWh'iCh is in}a,--spacedrelationwithmsaitlltnobela the opposite so Set, uponl :saidg cylinder17-. in-an-encompassingrelationis sleeve 20, the inner end'ofwhichisgprovided with an outwardly extendingtbevelledl-fiange 2 1 Saidsleeve 20 is {telescopically receivable within s1e'eve F13, lflanges t14 and 21- a of said-"sleeves I "13. and: =20, mespectively, beinginterengaged and normallwhavingitheir =bevelledlsurfaces in contae-t;as-:at-22.l-Ihe :outer free end i of said sleeve 20. fisvin at spaceds-relationwwithithe' adjacent wface of knob tl9.

wStpupon-flsaid i'sl'eeve ds :anothe'r' outer sleeve 23,- the inner endzof .--which-. is, provided with an outwardly extending flange a24,-substantially= .of :=the :diameter corresponding, to -:the.=diameterofssleeve'fli. =Said-flange 24 is in-contact-with the adjacent end ofsaid sleeve .15.

The-"outer freeaend of, saidwsleeve23 .is :normally" in. contact withthe adjaeent i-nnerface of-iknob: 19. I

iCyalinder 1 7,- and-.isleeves 202 and 23 areeach provided withdiametric openings of a sulficienttolerance torreceive therewithinifonloose QEOSltlQIliIlg-wOf "shaft or rod 25. t This vis: also t trueof:the opemngsmade in; cylinder 10 and sleevesJB and: 15, which, beforethe, operation of either: of knobs\1-2 or'19:, are'zcapable ofzreceivingishaft 16. or loose positioning;

If r it --betsassumed-:.-thati shaft 1:16-is .:helii :loosely within thecamp, vthat is beforefknobi 12 hasxbeentturned, upon boss $11.toLshif-tt the former toward, scylinderzwlfi, turning. of knobdQ-tow-ard{cylinder 1-7 wi1li alonez suflice invorder I to clamp iboth:shafts.(Due:tovthenengagement of. said sleeve -23--t0 one direction, ..and theforcei'olfcylinder 1:7 in the opposite di'rectiOm Ew-iIl firmII iclampisaid shaft 25"=Within thezaendi ofshe clamping :devi'ee within whichcylinder '17: is positioned; iSimultaneously '"with: the last mentioned:clamping action 'ofk thetdeuicetupon 'shaftf'25 clamping; actiom uponshaft 1'6 is a .exertedz due' to: the rtwo forces to opposite directionsset in operation; bytknob '19, namely: theforce of'ste'ndenc ctotshift:onntheiparrtiofssleeve ls toward knob :lz bnoughtz-gbouti bypressure: upon *theadjacentnend of? said =sleeve --15g'by flange- 24,'andth'e force to the opposite direction exerted upon sleeve 13 broughtabout upon said sleeve 13 by the action thereon by sleeve 20 due to theinterconnection of the latter with sleeve 13 through flanges 14 and 21and their contacting bevelled surfaces 22. This latter force was due tothe tendency of cylinder 17 to shift toward knob 19, and since cylinder17 is interconnected with sleeve 20 through shaft 25, it necessarilymust follow that when cylinder 17 shifts toward knob 19 it must exert anurge upon sleeve 20 to shift to the same direction. The latter urge toshift on the part of sleeve 20 will be transferred to sleeve 13 throughthe flanged connection between the two sleeves.

From the hereinabove description it will be apparent that when knob 19is loose upon boss 18 and out of engagement with the adjacent end ofsleeve 23, the

operation of knob 12 alone will suflice to lock shaft 16 in the clampwithout affecting shaft 25. The latter will remain loose within theclamp. This result is due to the fact that operation of knob 12 aloneactuates only cylinder and sleeve 13 for drawing the two in the oppositedirections. This result does not affect in any manner either cylinder 17or sleeve 20 or 23. However, regardless of the condition of knob 12,that is irrespective whether the latter knob is loose or in lockedengagement with sleeve 13, the operation of knob 19 will tend to clampshaft 16 due to the urging of sleeves 13 and to shift to the oppositedirections, by virtue of the action upon said two sleeves 13 and 15 byflange 21 and flange 24, respectively, under the influence of knob 19,as was hereinabove described.

It is further observed that due to the interengagement of sleeves 13 andthrough flanges 14 and 21, respectively, the two principal parts of theclamping device will be incapable of separation in a longitudinaldirection, when attempted to be drawn in the direction away from the twocylinders 10 and 17.

Separation of the two principal parts of the clamping device to thedirection toward cylinders 10 and 17 will equally be impossible due tothe bearing of flange 24 against the adjacent end of sleeve 15.

However, when knob 19is loose, irrespective of the condition of knob 12,it is possible to bring about bodily rotary shifting movement ofcylinder 17 and its cooperating parts, including sleeves 20 and 23 andknob 19, together with shaft 25, with relation to cylinder 10 and itscooperating parts, including sleeves 13 and 15, knob 12 and shaft 16.This result is due to the fact that when knob 19 is loose the contactsbetween flanges 14 and 21 at bevelled surfaces 22, on one hand, andbetween L flange 24 and the adjacent end of sleeve 15, on the other, aredevoid of friction and therefore susceptible of relative rotation.

From what has been said it will therefore be clear that when both knobs12 and 19 are loosely positioned upon their respective bosses 11 and 18shafts 16 and 25 may be freely shifted to one or the opposite directionso as to relatively adjust said shafts in longitudinal directions. Whensaid knobs 12 and 19 are in a loose position the shafts may also berelatively adjusted angularly by imparting relative rotary movements tothe two principal parts of the clamping device. When one or the other,or both adjustments have been made one or the other of the said knobsare manipulated to firmly clamp one or both of the said shafts withinthe clamping device.

Referring nOW more particularly to Fig. 1 there is shown oneexemplification of the practical adaptation of the present device touse. Shaft 16, which in this instance is stationary, is rigidlysupported upon base 26. Said shaft 16 of course is passed throughcylinder 10 and sleeves 13 and 15, said cylinder 10 and sleeve 13 beingactuable by knob 12. Moving the clamping device to or away from base 26will adjust the device with relation to shaft 16.

When the device has been shifted upon shaft 16 to a predetermined heightabove base 26, by turning knob 12 shaft 16 will be locked to theclamping device.

The upper end of shaft 25 in Fig. 1 is made to support casing 27containing a dial indicator actuable by pin 28 extending from casing 27and made to contact with cylindrical work 29 which is being fashioned bya lathe or a similar machine.

After the clamping device had been made firm with shaft 16 shaft 25 waslongitudinally shifted within the clamping device in order to bring pin28 in contactual r shaft of a certain diameter.

relaton with the periphery of work 29. When that was done knob 19 isturned in order to lock shaft 25 in its adjusted position within theclamping device. Great many instances may be found of various practicalapplications of the clamping device where knob 12 need not be operatedfirst in order to clamp shaft 16 first in the clamping device, but knob19 may be resorted to directly to clamp both shafts 16 and 25simultaneously.

The modified form of the invention illustrated in Figs. 6 and 7 includescylinder 30 having at one of its ends reduced, concentric, threaded boss31 engageable by knob 32. Sleeve 33 superimposes said cylinder 30 in anencompassing relation. The end of said sleeve 33 farther removed fromknob 32 has an inwardly directed flange 34. A coil spring 35 encompassesboss 31 and is interposed between the adjacent end of cylinder 30 andknob 32. The adjacent end of said sleeve 33 is spaced from knob 32, asat 36.

Encompassing said sleeve 33 is. outer sleeve 37, the adjacent end ofwhich is normally in contact with knob 32, while the opposite end ofsaid sleeve 37 terminates short of the adjacent end of inner sleeve 33.

A diametrical bore is made through cylinder 30 and sleeves 33 and 37 forreception therewithin of shaft 16. Another bore 38 is made in the saidthree parts at a right angled relative position to said first namedbore. Bore 38 however is of a diameter smaller than the diameter of thefirst named bore. The two bores are capable of receiving two shafts, oneat a time, of two varying diameters. Thus, when shaft 16 is removed fromits bore another shaft, of a smaller diameter may be inserted within theclamp and bore 38.

The operation of the parts of the modified form of the invention lasthereinabove described is similar to the corresponding parts of thepreferred invention. When knob 32 is turned to drive the same in thedirection of cylinder 30, said cylinder tends to shift toward knob 32.Knob 32 exerting pressure at the adjacent end of sleeve 37 tends to urgethe latter to the direction opposite from that to which cylinder 30 isbeing urged. The opposite pressures upon shaft 16 by cylinder 30 andslleeve 37 firmly clamp said shaft 16 within the clamping evice.

Coacting with sleeve 33 is cylinder 39, having at one of its ends anoutwardly extending flange 40. The inner end of said cylinder 39 and theadjacent end of cylinder 30 are in a mutually spaced relation. Flange 40is normally in engagement with flange 34, by virtue of which arrangementcylinder 39 is interlocked with inner sleeve 33.

Set upon cylinder 39 in an encompassing relation is a pair of rings 41.One of said rings 41 is seated upon the adjacent end of ferrule 42 whichencompasses the adjacent end of inner sleeve 33, and rests upon theinner end of outer sleeve 37. Ferrule 42 extends beyond the adjacent endof inner sleeve 33, effecting space 43 between the adjacent end ofsleeve 33 and one of said rings 41.

Each of said rings 41 at the adjacent opposed ends has a plurality ofsemi-circular recesses 44. Said recesses 44 extend radially in each ofsaid rings 41. Two pairs of opposed recesses in the two rings upon adiametrically transverse line through the device define a bore of thesame diameter for passing therethrough a Shaft 25 is extended throughcomplementary bores in the two rings 41 and in a diametrical relationtherewith, for clamping the same within the two of said rings 41.Extending from one ring 41 is pin 45. The other of said rings 41 isprovided with bore 46 into which said pin enters. By virtue of thisarrangement two rings 41 are interlocked in a lateral direction, but arecapable of separation in a longitudinal direction.

The opposed pairs of recesses 44 in rings 41 may be made in differentdiameters. Cylinder 39 may have a plurality of bores also of differentdiameters, all for the purpose of accommodating shafts 25 ofcorresponding diameters.

Washer 47 is placed upon the adjacent end of one ring 41. Knob 48 in athreaded engagement with threaded boss 49 normally contacts said washer47. The adjacent end of cylinder 39 is in a spaced relation with saidwasher 47 or knob 48.

When knob 48 is turned upon boss 49 toward cylinder 39, said cylinderwill necessarily be drawn toward said knob 48. Washer 47 bears againstthe adjacent end of one of said rings 41 causing said ring to exertclamping pressure upon shaft 25. 'lhe pressure exerted by said knob 48upon two ri..gs 41 is transferred through ferrule 42 to outer sleeve 37.Said pressure exerted upon sleeve 37 is in turn transferred to and uponshaft 16 to the direction toward the opposite knob 32. Simultaneously,due to the pull exerted upon cylinder 39 by knob 48 pulling force isexerted upon inner sleeve 33 to the direction away from said knob 32.This latter pulling force-is of course accomplished through theinterconnection of cylinder 39 with inner sleeve 33 through flanges 34and 40. Due to the opposed pulling pressures upon shaft 16 exertedthereon by sleeves 33 and 37 shaft 16 is firmly clamped within thedevice.

Thus, by virtue of the operation of knob 48 hereinabove described bothshafts 25 and 16 will be firmly and rigidly interlocked with theclamping device. Of course, said shafts may be longitudinally as well asangularly adjusted with relation to each other, same as in the preferredform of the invention. Spring 35 has no other function except to urgecylinder 30 away from knob 32, and with it also sleeve 33, the latterdue to the interconnection with cylinder 30 through shaft 16, so that incooperation with the outer sleeve 37 a frictional force may bemaintained at all times upon shaft 16, even though knob 32 is quiteloose. By virtue of that frictional force the weight of the device alonewill not be suificient to cause shifting of the device downwardly in avertical direction before proper adjustment of the device upon shaft 16had been made and prior to driving knob 32 to its operative condition.

It is noted that the bores in sleeve 23 should preferably be made ofsomewhat larger diameter than the bores in cylinder 17 and sleeve 20.

It is further observed that for all practical intents and purposes, andwithout detracting in any manner from the proper operation of themodified form of the invention shown in Figs. 6 and 7, ferrule 42 may bemade an integral part of the outer sleeve 37. Accordingly, sleeve 37 andferrule 42 may be considered as one sleeve 37, the adjacent end of whichextends to and contacts the adjacent end of ring 41 While there isdescribed herein preferred embodi- 6 ments of the present invention, itis nevertheless to be understood that minor changes may be made thereinwithout departing from the spirit and scope of the invention as claimed.

What I claim as new is:

1. A clamping device comprising a pair of clamping units, each of saidclamping units including a plurality of cylindrical members in atelescopic mutual relation, said cylindrical members in each clampingunit being provided with registering transverse bores for extending ashaft therethrough, means in association with one of said clamping unitsfor urging said cylindrical members in opposite directions for clampingthe shaft which remains extended through said unit, and means inassociation with the other of said clamping units for selectively urgingthe cylindrical members in both of said units in the opposite directionsfor simultaneously clamping both shafts within said clamping units.

2. A clamping device comprising a pair of clamping units, each of saidclamping units including a plurality of cylindrical members in atelescopic mutual relation, said cylindrical members in each clampingunit being provided with registering transverse bores for extending ashaft therethrough, means in association with one of said clamping unitsfor urging said cylindrical members in opposite directions for clampingthe shaft which remains extended through said unit, and means inassociation with the other of said clamping units for selectively urgingthe cylindrical members in both of said units in the opposite directionsfor simultaneously clamping both shafts within said clamping units, someof the cylindrical members in both of said clamping units beinginterconnected in such a manner as to cause the action of said secondnamed means to be extended upon the cylindrical members of the saidfirst named unit.

References Cited in the file of this patent UNITED STATES PATENTS

